A: A blood moon is a deep reddening of the moon caused by the Earth passing between the moon and the sun. During the period of the eclipse, light from the sun... Full Answer >
Sometimes, bones are the only accessible source of DNA, thanks to their structure, which preserves DNA comparatively well and for a long time. The main problems of DNA extraction from bones are DNA degradation due to environmental factors and the presence of soil-derived inhibitors like humus acids [1â10].
Polynesian DNA found in old Native American bones. Image of the Botocudo via Wikimedia Commons from the New York Public Library. Polynesian DNA has unexpectedly been discovered in the bones of now-extinct Native Americans who once lived in the interior of Brazil.